20211206 20483200 1.0 TRUE Tailings This feature class contains Comstock-era tailings locations throughout Operable Unit 1 (OU1) of the Carson River Mercury Site (CRMS) within Lyon and Storey Counties, Nevada. Piedmont Engineering was contracted by NDEP to conduct an archeological survey of Comstock-era mining and milling features. These locations were obtained in order to define the investigation area boundaries of the Carson River Mercury Site. The field survey took place in 1993; NDEP later created the geospatial data representing the surveyed features. Additional features were added by NDEP using historical documents and aerial imagery. The hardcopy Piedmont Engineering maps of Comstock-era mills and tailings sites were georeferenced by NDEP. Tailings polygons were digitized in ArcGIS Desktop. The original hardcopy maps were drawn at a scale of 1:2400 (written as 1" = 200' in the maps). Full metadata: https://edg.epa.gov/metadata/catalog/search/resource/details.page?uuid=%7BC714D8F6-61A4-4E17-85A5-6D0C79EFD101%7D NDEP Bureau of Corrective Actions